The dynamics of bursting process in wall turbulence

被引：173
作者：
Itano, T [1 ]
Toh, S [1 ]
机构：
[1] Kyoto Univ, Grad Sch Sci, Div Phys & Astron, Kyoto 6068502, Japan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2001年 / 70卷 / 03期
关键词：
wall turbulence; coherent structure; traveling wave solution; low-dimensional dynamics; bursting process; turbulence generation;
D O I：
10.1143/JPSJ.70.703
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have examined bursting processes observed in turbulent channel flow by direct numerical simulation of the incompressible Navier-Stokes equations in a minimal flow unit. A traveling wave solution (TWS) is obtained by a shooting method. The TWS corresponds to a saddle point in a two-dimensional phase space. A low-dimensional dynamics confined to the near-wall region is proposed in terms of the TWS and its manifolds. The characteristics of the coherent structures constituting the TWS are investigated dynamically and statistically in detail. The dynamics well describes an elementary process of intermittent turbulent regeneration in wall turbulence.
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收藏
页码：703 / 716
页数：14
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